Automatic dispensing nozzle



A ril 4, 1967 w. A. KNAPP u, ETAL AUTOMATIC DISPENSING NOZZLE 2 Sheets-Sheet 2 Filed Nov. 29, 1965 INVENTORS ATTOHIVL'YS United States Patent of Missouri Filed Nov. 29, 1963, Ser. No. 326,814 4 Claims. (Cl. 141-214) This invention relates to automatic dispensing nozzles, and more particularly to dispensing nozzles such as are used in the dispensing of fuel and the like to motor vehicles.

In the dispensing of fuel, such as gasoline and the like, to motor vehicles, it is desirable that the nozzle have an automatic cut-off for terminating fluid flow in response to liquid level in the fuel-receiving tank or container with an arrangement whereby the operator may place the end of the nozzle in a fill opening, manually open a valve and latch said valve in open position to start the dispensing of the fuel and have a dependable automatic cut-off to stop the flow of fuel when the fuel in the tank reaches a level, as for example above the delivery end of the nozzle. It is important that the automatic cut-off be such that the operation thereof is assured; otherwise, on failure of the cut-off the tank could run over, spilling fuel therearound, creating a hazardous condition. In order to assure proper operation for valves in dispensing nozzles, the manually operated valve should seat in the direction of flow and be such as to resist substantial fluid supply pressure without leakage that could occur in nozzles where the valve seats against such pressure. Also, when the valve structure is closed, either the automatic cut-off or the manually operated valve, the structure should have such seals to hold substantial fluid pressures without leakage through any portion because any leakage may create a dangerous condition. Furthermore, the nozzle and valve structure should be rugged and durable, but simple in construction for economical manufacture and ease of maintenance.

The principal objects of the present invention are to provide an automatic dispensing nozzle which gives the features and advantages above-mentioned in a structure wherein the valve is seated in the direct-ion of the fluid flow and thereby utilizes the supply pressure in seating and maintaining the seat in the control valve; to provide such a structure with a latch mechanism to retain the control valve open independent of manual pressure and an automatic shut-off operable independently of the control valve in response to a predetermined liquid level relative to the nozzle end, said automatic shut-off being maintained in seated shut-off position by fluid supply pressure; to provide such a structure wherein the automatic shut-off remains in flow stopping position until the valve thereof is unseated by closing of the manual control valve; to provide such a structure wherein the automatic shut-off includes a ball valve with resilient means urging same laterally out of the fluid flow path and a suction-actuated diaphragm and plunger operative to overcome the resilient pressure and move the ball valve adjacent to its seat whereby the pressure of the fluid supply seats same; to provide such a structure with seal means between the plunger and body to eliminate any leakage from the flow passage to the suction chamber; to provide such a structure wherein the suction chamber has communication with a port adjacent the nozzle end and a passage to the flow passage of the fluid adjacent the control valve which forms a venturi inducing air flow into the fluid passage which forms a suction in the suction chamber when the opening adjacent the nozzle is closed by the liquid level being thereabove; and to provide an automatic dispensing nozzlev that is economi- 3,312,257 Patented Apr. 4, 1967 cal to manufacture and assemble with a minimum of joints and seals and a positive operation for assurance of efliciency and effectiveness.

Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawings wherein are set forth by way of illustration and example certain embodiments of this invention.

FIG. 1 is a longitudinal sectional view through an automatic dispensing nozzle embodying the features of the present invention and with the control valve in flowclosing position.

FIG. 2 is a partial lonigtudinal sectional view through the dispensing nozzle with the control valve in open position for flow of fluid therethrough.

FIG. 3 is a partial longitudinal sectional view through the dispensing nozzle similar to FIG. 2, but with the automatic shut-off in flow-closing position.

FIG. 4 is an enlarged transverse sectional view through the automatic cut-off valve chamber.

FIG. 5 is a top plan view of the automatic dispensing nozzle.

FIG. 6 is a transverse sectional view through the hand lever latch taken on the line 6 6, FIG. 1.

Referring more in detail to the drawings:

The reference numeral 1 generally designates an automatic dispensing nozzle having a body 2 with a discharge tube 3 connected at one end and a generally cylindrical hose-receiving portion 4 at the other end. The hosereceiving portion 4 is illustrated as having an internally threaded portion 5 adapted to be connected to a fluid supply hose in a conventional manner. The body 2 has a portion 6 extending forwardly from the portion 4 and provided with an internal substantially cylindrical bore providing a fluid passage 7, said portion 6 extending to an enlarged head 8. On the opposite or forward side of the head the body has a substantially cylindrical extension 9 with a fluid flow passage 10 therein. In the illustrated structure, the extension 9 has an internally threaded portion 11 adjacent the end thereof and the tubular member 3 has a threaded end 13 screwed therein with a locking collar 12 threaded on said tube into engagement with the end 14 of the extension 9 to lock the tube against rotation. Y

The head 8 has an upstanding portion preferably terminating in a planar surface 15 "from which a vertical bore 16 extends into said body and forms avalve inlet chamber terminating in a conical valve seat 17 surrounding a passage 18 which communicates with the bore 10 of the extension 9. A second bore 19 extends from the face 15 vertically into the body and spaced from the inlet chamber or bore 16 toward the portion 4 of said body. The second bore 19 intersects an adjacent portion 20 of the flow passage 7 and is preferably substantially the same diameter, said second bore having a ball valve member 21 loosely mounted therein. The bore 19 communicates with the inlet chamber 16 through a port 22 having a circular ball seat 23 adapted to be engaged by the ball 21 to stop flow therethrough.

A flow deflector and ball guide 24 is mounted in the passage portion 20 and has a solid portion 25 that fits the upper part of the passage portion 20 and is secured in place by a suitable fastening device such as a screw 26 threaded therein, the head 27 of the screw preferably being positioned in a counterbore 28 extending inwardly into the body from the surface 15, as illustrated in FIG. 1. The lower surface of the solid deflect-0r portion 25 is curved downwardly from the upper portion of the bore toward the ball-receiving bore 19 and terminates in a large end which substantially fills a portion of the passage 20, as for example in the natureof one-half the cross-section thereof. The flow deflector and ball guide ha a depending rib 29 that extends to the lower portion of the passage portion and has an edge toward the ball 21 that is inclined downwardly from the large end of the solid portion 25 to guide the ball toward the seat 23 as the ball is moved downwardly in the ball-receiving bore 19, as later described.

The body 2 has a depending portion 31 with a bore 32 extending vertically therein in substantially opposed relation to the bore 19, said bore 32 having communication with the lower part of the passage portion 20 and having an internally threaded portion 33 adjacent the outer end thereof. A plug member 34 has a threaded shank screwed into the internally threaded portion 33 and a head 35 that engages the outer face of the depending portion 31 with a suitable gasket 36 interposed therebetween to form a fluid-tight seal.

The plug 34 has a cavity 37 extending therein from the inner end 38 of the shank, said cavity terminating as at 39 in spaced relation to the head end of the plug and being adapted to slidably receive a spring 40 with the inner portion of said spring sleeved on a shank 41 of a plunger 42 having a head 43 engaged by said spring to effect engagement of said head with said ball 21 and resiliently urge said ball laterally upwardly from the fluid flow path passing under the solid deflector portion 25 to the port 22, as illustrated in FIG. 1.

A plate member 44 is mounted on said body in covering relation to the planar surface 15 with a suitable gasket 45 interposed therebetween to form a fluid-tight seal, said plate member being secured to the body by suitable fastening devices such as screws 46. The plate member 44 has a cavity 47 extending therein from the upper surface 48 in substantially coaxial relation to the ball-receiving bore 19 to form a vacuum chamber. The vacuum chamber or cavity 47 is closed by a cover 49 secured by suitable fastening devices such as screws 50 which retain the cover on the plate member 44 and also aid in retaining the plate member on the body head 8. The cover 49 is provided with an air vent 51. Secured between the cover 49 and the plate 44 in sealed engagement around the periphery of the vacuum chamber is a flexible diaphragm 52 mounted together with a metal disc 53 adapted to engage the upper end of a plunger 54 to move same, as later described. In the illustrated structure, the plunger 54 abuts against a metal disc 53 which is suitably secured to the diaphragm 52 by a fastening device such as a rivet 55. The plate member 44 in the lower portion of the cavity 47 has an upstanding boss 56 provided with a bore 56' substantially coaxial with the ball-receiving bore 19 to slidably mount the plunger 54 which extends therethrough. The plate member 44 also has a counter-bore 57 in which is secured a seal retainer 58 having a resilient seal member 59 such as an O-ring slidably and sealingly engaging the plunger 54. The plunger is preferably of a material such as tetrafluoroethylene or the like that cooperates with the O-ring seal to assure sensitive movement with low friction and to form a long wearing positive seal. The plunger 54 has an enlarged portion or head 60 at its lower end below the plate member 44 whereby the plunger can reciprocate and said head is adapted to engage the ball 21 when in its uppermost position. The plunger, when actuated by the diaphragm 52 under a vacuum in the cavity 47, has sufficient movement and power to overcome the spring 40 and force the ball 21 and the plunger 52 downwardly with the ball being guided by the inclined surface 30 to move to a position substantially in registry with the seat 23 whereby fluid pressure of the supply will elfect seating of the ball on said seat 23.

The vacuum supply for the cavity 47 is provided by a passage 67 that extends from the cavity forwardly and then downwardly in the body 2 in spaced relation to the bore 16. The passage 67 communicates with a passage 68 in a tube 69 which has its end 70 secured in the lower end of the passage 67 adjacent the bore 10 by a suitable fastening device such as a screw 71. The tube 69 extends downwardly through the tubular nozzle end 3 and has its lower end connected as at 72 in a fluid-tight connection with a flexible tube 73 which has its lower end connected on a neck 74 of an orifice fitting 75. The orifice fitting 75 is suitably secured on the inside of the tubular member 3 adjacent the discharge end 76 thereof by an orifice member 77 which has a port 78 communicating the exterior of the tubular member adjacent said end with a bore 79 extending through the neck 74 and communicating with the interior of the tube 73. A passage 84) provides communication from the upper end of the tube 69 with the flow passage 18 adjacent to and downstream from the seat 17. There is preferably an annular venturi passage 81 immediately below the conical seat 17 that opens into the passage and is arranged whereby fluid flow through the passage 18 tends to induce a fiow of air inwardly through the passage 80. The port 78 in the orifice member 77 is small to provide substantial resistance to liquid flow into the tube 73, but provides little air flow resistance whereby, in normal flow of fluid through the nozzle and discharge tube 3, air will enter the orifice port 78 and flow through the bore 79, tube 73 and tube passage 68, passage 80, to satisfy the demands of the venturi groove 81. When air flow into the'orifice port 78 is cut off as by the rise of liquid in a tank being filled to a point above the orifice port 78, the requirements for the venturi groove 31 creates a suction that pulls a vacuum in the cavity 47 to actuate the diaphragm 52 and move the plunger 54 in the bore 19.

A main control valve member 82 has a conical face 83 adapted to be received by the seat 17 to shut off flow through the passage 18. The valve member 82 includes a stem 84 that extends through and is slidably mounted in a bore 85 in a depending boss 86 on the body 2. The bore 85 is substantially coaxial with the inlet chamber or bore 16. A suitable seal is provided for the stem to prevent leakage through the bore 85. In the illustrated structure, an O-ring 87 is arranged in a groove 88 on the stem whereby the O-ring is in slidable sealing engagement with the bore 85 to form the seal. The stem 84 extends upwardly through the passage 18 and has a reduced portion 89 on which is sleeved a conical member 90 which has an extension 91 on which is sleeved a resilient seat member 92. Sleeved on the stem extension is a spoollike member 93 having an enlarged lower end 94 engaging the upper portion of the resilient seat member 92. The conical member 90, resilient member 92 and spool member 93 are held on the stem extension by a suitable fastening device, as for example a nut 95 screwed on the upper end of the extension which is threaded. The spool has an upper plate 96 engaged by the lower end of a spring 97, the other end of which engages the plate member 44 whereby the spring urges the valve 82 to closed position against the seat 17. The plate 96 is of such diameter and is so located that when the main valve 82 is in seated position the edge of said plate is adjacent the port 22 and the spacing between the inlet chamber 16 and bore 19 is such that when the ball is seated to close the port 22 a portion of the ball extends into the inlet chamber, as illustrated in FIG. 3. The ball is permitted to seat when the main valve 82 is in open position, but the extension of the ball into the inlet chamber is such that when the main valve 82 is in seated position the plate 96 engages the ball and forces same from its seat to equalize pressure between the bore 19 and the inlet chamber 16 whereby the spring 40 and plunger 42 can force the ball upwardly in the bore 19 to the position illustrated in FIG. 1.

A hand lever 98 is provided for opening the valve 82 for dispensing of fluid. The forward end 99 of the lever is pivotally mounted on a pin 100 to suitable ears 101 on the extension 9. The pin 100 also mounts the forward ends of a guard plate 102, the other end of said guard plate being secured by suitable fastening device 103 to a depending lug 104 on the body portion 4. The lever 98 has a stem pressing surface 105 on its inner surface in line with the stem 84. Beyond the surface 105, the lever curves upwardly and then downwardly to provide an arcuate grip portion 106. The free end 107 of the lever is movable between side plate portions 108 and 109 at the rear portion of the guard that defines a way 110 for movement of the rear or free end portion 107 of the lever as it is pivoted in actuating the valve 82. The plate portion 109 is recessed to provide a cavity 111 in which a latch plate 112 is movable on guide pins 113. The guide pins are secured by threaded portions 114 being screwed into threaded bores 115 in the plate portion 109 inwardly of the cavity 111. The guide means 113 have heads 116 forming stops to limit outward movement of the plate 112 and springs 117 urge said plate outwardly. The latch plate is provided with a plurality of spaced pins 118 slidably mounted in bores 119 in the plate portion 109 inwardly of the cavity 111 whereby said pins 118, when the latch plate is moved inwardly, extend into the way 110 in which the free end 107 of the lever moves whereby when the lever is moved upwardly to open the valve 82 with the free end positioned above one of the pins 118 and the latch plate 112 moved inwardly to position the inner portion of the pins 118 in the way, release of the lever will allow the free end to engage a pin 118 to retain the valve in the selected open position, the pressure caused by the spring 97 acting through the stem 84 onto the lever 98 to apply suflicient force between the handle lever end 107 and the particular latch pin 118, causing a friction that retains the latch plate in inwardly pressed position, resisting the action of the springs 117. In the structure illustrated, there are three pins 118 providing selected positions for the lever 98 whereby the valve 82 may be opened for partial flow or may be opened for full flow. The latch plate 112 is released by lifting the lever 98 slightly to disengage same from the respective latching pin whereby the springs 117 will move the latch plate outwardly and release the lever 98 whereby it can be returned to the position wherein the valve 82 is closed. as in FIG. 1.

In the illustrated structure, the cover member 49 is preferably of non-ferrous metal and is provided with an outwardly opening socket 120 in which is secured a permanent magnet 121 adapted to hold the fil-lcap of a tank being filled. Also, it is preferred that a thin sheath 122 of resilient synthetic resin be bonded to the outer surface of the cover 49 and the forward portions of the plate member 44 and body 2 including the extension 9 to form a cushion covering to substantially eliminate scratching or abrading of finishes on surfaces adjacent the fill opening of the tank, as for example, the surrounding body portions of an automobile.

In the operation of an automatic nozzle constructed and assembled as described, in delivering fluid to a tank or the like the tubular portion 3 is inserted in the fill opening of the tank with a hose connected to the body to supply fluid under pressure thereto. The parts of the nozzle structure are then in the position illustrated in FIG. 1. The lever 98 is then lifted to raise the valve 82 from its seat 17 to a point of desired flow. The flow then passes through the flow passages 7 and 20, under the deflector 25, under the ball 21, through the port 22, inlet chamber 16, passage 18 and through the tubular member 3 into the tank. The latch plate 112 is then pushed inwardly whereby a pin 118 is positioned under the free end 107 of the lever 98 and the lever released whereby said free end will engage the pin to hold the valve lever in the valve opening position. The flow of the fluid through the passage 18 creates a suction inducing air flow through the passage 80 which draws air through the port 78 and through the tubes 73 and 69 to supply the requirements for the venturi action whereby the parts during the flow remain in the position illustrated in FIG. 2. When the liquid level in the tank being filled raises to a point wherein said liquid closes the port 78, no air can pass therethrough to supply the requirements of the venturi action of the flow through the passage 18. Then the flow of the fluid through the pasage 18 creates a suction drawing air through the passage 67 tending to exhaust the air in the vacuum chamber 47 causing the diaphragm 52 to move inwardly, moving the plunger 54 to push the ball- 21 downwardly, overcoming the pressure of the spring 40. As the ball 21 is forced downwardly by the plunger 54, said ball moves along the inclined surface 30 of the ball guide to a position in alignment with the seat 23, and the valve plate 96 being in the position illustrated in FIG. 2, it does not interfere with the ball. Therefore, the fluid flow pressure will effect seating of the ball in sealing engagement with the seat 23 to shut off flow, as illustrated in FIG. 3. The flow will remain shut off until the operator releases the latch for the lever 98 whereby the lever returns to the position illustrated in FIG. 1, allowing the spring 97 to seat the main control valve on the seat 17. As this control valve seats, the plate 96 engages the ball 21, moving same from its seat, permitting the pressure to balance in the inlet chamber with that upstream therefrom, whereby the sprirrg 40- will move the plunger 42 to push the 'ball 21 upwardly. When the flow is shut off, there is no aspirating action at the venturi groove so that air can pass through the passage from the interior of the tubular member 3 to relieve the suction in the chamber 47.

It is to be understood that while we have illustrated and described one form of our invention, it is not to be limited to the specific form or arrangement of parts herein described and shown except insofar as such limitations are included in the claims.

What we claim and desire to secure by Letters Patent is:

1. A liquid dispensing nozzle including,

(a) an operable main valve closing in the direction of fluid flow,

(b) a ball movable in the path of fluid flow in advance of said valve,

(c) a flow-restraining seat for said 'ball,

(d) means carried on said main valve forming an obstruction restraining the ball from seating on said flow-restraining seat only when the main valve is in fluid flow-closing position, a flow deflector having a solid portion mounted in the path of fluid flow at one side thereof in spaced relation to said flow restraining seat to define a ball receiving recess therebetween at said one side, said deflector portion being spaced from the opposite side of said path and diverting flow therethrough with the ball while in said recess being substantial-1y free of seating force from said fluid flow,

(e) resiilent means normally urging said ball away from said seat into said recess, and

(f) pressure-responsive means operable by suction induced by fluid flow when the valve is unseated for acting on said ball to overcome the resilient means and move said ball to the seat whereby said ball is seated responsive to fluid flow to terminate the fluid flow through the nozzle.

2. A liquid dispensing nozzle including,

(a) a body having an inlet passage and a chamber extending substantially transversely of said passage and intersecting same in communication therewith,

(b) a second chamber spaced from said first-named chamber remotely of said inlet passage,

(0) a port communicating said first and second passages and having a ball valve seat in the first-named chamber,

((1) a discharge passage communicating with said second chamber and having a valve seat in said second chamber,

(e) a main valve in said second chamber and adapted to seat on the seat therein in the direction of fluid flow,

(f) manual means for opening said main valve against fluid pressure,

(g) a ball in said first chamber adapted to seat on the seat of the port communicating the first and second chambers to restrain flow therethrough, a flow deflector having a solid portion mounted in said first chamber filling the flow path at one side thereof in spaced relation to said port seat to define a ball receiving recess therebetween at said one side, said deflector portion being spaced from the opposite side of said first chamber and diverting flow through said space with the ball while in said recess being substantially free of seating forces of the fluid flow,

(h) resilient means normally urging said ball away from said port seat into said recess,

(i) means operable to preclude seating of said ball when the main valve is in flow-closing position and permitting seating of the ball valve when the main valve is open,

(j) pressure-responsive means including a tetrafluoroethylene plunger extending into the first chamber and operable by suction induced by fluid flow when the valve is unseated for engaging the plunger with said ball and overcoming the resilient means and moving said ball to the seat whereby said ball is seated responsive to fluid flow to terminate the fluid flow through the nozzle,

(k) and an O-ring in said body and engaging said plunger to cooperate therewith in providing a low resistance fluid tight seal therebetween for the reciprocation of the plunger.

3. A liquid dispensing nozzle including,

(a) a body having an inlet passage and a chamber extending substantially transversely of said passage and intersecting same in communication therewith,

(b) a second chamber spaced from said first-named chamber remotely of said inlet passage,

(c) a port communicating said first and second passages and having a ball valve seat in the first-named chamber,

(d) a discharge passage communicating with said sec- :ond chamber and having a valve seat in said second chamber,

(e) a main valve in said second chamber and adapted to seat on the seat therein in the direction of fluid flow,

(f) resilient means urging said main valve to seated position,

(g) manual means for opening said main valve against fluid pressure,

(h) releasable means for retaining said manual means in valve-opening position,

'(i) a ball in said first chamber adapted to seat on the seat of the port communicating the first and second chambers to restrain flow therethrough, a flow deflector having a solid portion mounted in said first chamber filling the flow path at one side thereof in spaced relation to said port seat to define a ball receiving recess therebetween at said one side, said deflector portion being spaced from the opposite side of said first chamber and diverting flow through said space with the ball while in said recess being substantially free of seating forces of the fluid flow,

(j) resilient means normally urging said ball away from said port seat into said recess,

(k) means carried on said main valve positioned at said port to preclude seating of said ball when the main valve is in flow-closing position and permitting seating of the ball valve when the main valve is open, and

(1) a pressure-responsive means operable by suction induced by fluid flow when the main valve is unseated for acting on said ball to overcome said ball urging resilient means and move said ball to the ball seat where it is seated responsive to fluid flow to terminate the fluid flow through the nozzle.

4. A liquid dispensing nozzle including,

(a) a body having an inlet passage and a chamber extending substantially transversely of said passage and intersecting same in communication therewith,

(b) a second chamber spaced from said first-named chamber remotely of said inlet passage,

(c) a port communicating said first and second passages and having a ball valve seat in the first-named chamber,

(d) a discharge passage communicating with said second chamber and having a valve seat in said second chamber,

(e) a main valve in said second chamber and adapted to seat on the seat therein in the direction of fluid flow,

(f) resilient means urging said main valve to seated position,

(g) manual means for opening said'main valve against fluid pressure,

(h) a ball in said first chamber adapted to seat on the seat of the port communicating the first and second chambers to restrain flow therethrough, a flow deflec tor having a solid portion mounted in said first chamber filling the flow path at one side thereof in spaced relation to said port seat to define a ball receiving recess therebetween at said one side,'said deflector portion being spaced from the opposite side of said first chamber and diverting flow through said space with the ball while in said recess being substantially free of seating forces of the fluid flow,

(i) resilient means normally urging said ball away from said port seat into said recess,

(j) means carried on said main valve positioned at said port to preclude seating of said ball when the main valve is in flow-closing position and permitting seating of the ball valve when the main valve is open,

(k) a pressure-responsive means including a tetrafluroethylene plunger extending into said first chamber and normally in retracted position in response to the resilient means urging the ball away from the seat,

(1) O-ring means in said body engaged with said plunger and forming a fluid-tight seal for reciprocation of said plunger, and

(m) a venturi opening in the discharge passage adjacent the seat of the second chamber and having communication with the fluid pressure-responsive means and a vent adjacent the end of the discharge passage to provide a suction satisfied by flow of air through the vent which upon closing of the vent acts on the pressure-responsive means to move the plunger and the ball to the ball seat Where it is seated responsive to fluid flow to terminate the fluid flow through the nozzle.

References Cited'by the Examiner UNITED STATES PATENTS 749,810 1/1904 Truman 137-519.5 1,918,544 7/1933 House et a1. 2,702,659 2/1955 Henry 141-218 X 2,837,240 6/ 1958 Boone 141218 X 2,981,299 4/1961 Henry 141209 2,982,318 5/1961 Ferreri. 3,088,500 5/1963 Payne 141209 X 3,113,593 12/1963 Vicard 138-40 X 70 LAVERNE D. GEIGER, Primary Examiner.

E. EARLS, Assistant Examiner. 

1. A LIQUID DISPENSING NOZZLE INCLUDING, (A) AN OPERABLE MAIN VALVE CLOSING IN THE DIRECTION OF FLUID FLOW, (B) A BALL MOVABLE IN THE PATH OF FLUID FLOW IN ADVANCE OF SAID VALVE, (C) A FLOW-RESTRAINING SEAT FOR SAID BALL, (D) MEANS CARRIED ON SAID MAIN VALVE FORMING AN OBSTRUCTION RESTRAINING THE BALL FROM SEATING ON SAID FLOW-RESTRAINING SEAT ONLY WHEN THE MAIN VALVE IS IN FLUID FLOW-CLOSING POSITION, A FLOW DEFLECTOR HAVING A SOLID PORTION MOUNTED IN THE PATH OF FLUID FLOW AT ONE SIDE THEREOF IN SPACED RELATION TO SAID FLOW RESTRAINING SEAT TO DEFINE A BALL RECEIVING RECESS THEREBETWEEN AT SAID ONE SIDE, SAID DEFLECTOR PORTION BEING SPACED FROM THE OPPOSITE SIDE OF SAID PATH AND DIVERTING FLOW THERETHROUGH WITH THE BALL WHILE IN SAID RECESS BEING SUBSTANTIALLY FREE OF SEATING FORCE FROM SAID FLUID FLOW, (E) RESILIENT MEANS NORMALLY URGING SAID BALL AWAY FROM SAID SEAT INTO SAID RECESS, AND (F) PRESSURE-RESPONSIVE MEANS OPERABLE BY SUCTION INDUCED BY FLUID FLOW WHEN THE VALVE IS UNSEATED FOR ACTING ON SAID BALL TO OVERCOME THE RESILIENT MEANS AND MOVE SAID BALL TO THE SEAT WHEREBY SAID BALL IS SEATED RESPONSIVE TO FLUID FLOW TO TERMINATE THE FLUID FLOW THROUGH THE NOZZLE. 